OSX/MaMi hijacks macOSís DNS settings to intercept traffic by routing it through malicious servers...But unless you did something to bypass macOSís Gatekeeper security, you likely have nothing to worry about since the malwareís executable isnít signed by Apple.

Quote from: Hacker News

Patrick [Wardle] believes that the attackers could be using lame methods like malicious emails, web-based fake security alerts/popups, or social-engineering type attacks to target Mac users.

Open System Prefs->Network. Click "Advanced" and then the "DNS" tab. Look for:

82.163.143.135 82.163.142.137

If you find those IP addresses, you have been infected by the malware. Currently no fix, but you can at least delete those two addresses.